linux/drivers/scsi/libsas/sas_init.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

317 lines
8.2 KiB
C

/*
* Serial Attached SCSI (SAS) Transport Layer initialization
*
* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
* Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
*
* This file is licensed under GPLv2.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>
#include "sas_internal.h"
#include "../scsi_sas_internal.h"
struct kmem_cache *sas_task_cache;
/*------------ SAS addr hash -----------*/
void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
{
const u32 poly = 0x00DB2777;
u32 r = 0;
int i;
for (i = 0; i < 8; i++) {
int b;
for (b = 7; b >= 0; b--) {
r <<= 1;
if ((1 << b) & sas_addr[i]) {
if (!(r & 0x01000000))
r ^= poly;
} else if (r & 0x01000000)
r ^= poly;
}
}
hashed[0] = (r >> 16) & 0xFF;
hashed[1] = (r >> 8) & 0xFF ;
hashed[2] = r & 0xFF;
}
/* ---------- HA events ---------- */
void sas_hae_reset(struct work_struct *work)
{
struct sas_ha_event *ev =
container_of(work, struct sas_ha_event, work);
struct sas_ha_struct *ha = ev->ha;
sas_begin_event(HAE_RESET, &ha->event_lock,
&ha->pending);
}
int sas_register_ha(struct sas_ha_struct *sas_ha)
{
int error = 0;
spin_lock_init(&sas_ha->phy_port_lock);
sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
if (sas_ha->lldd_queue_size == 0)
sas_ha->lldd_queue_size = 1;
else if (sas_ha->lldd_queue_size == -1)
sas_ha->lldd_queue_size = 128; /* Sanity */
sas_ha->state = SAS_HA_REGISTERED;
spin_lock_init(&sas_ha->state_lock);
error = sas_register_phys(sas_ha);
if (error) {
printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
return error;
}
error = sas_register_ports(sas_ha);
if (error) {
printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
goto Undo_phys;
}
error = sas_init_events(sas_ha);
if (error) {
printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
goto Undo_ports;
}
if (sas_ha->lldd_max_execute_num > 1) {
error = sas_init_queue(sas_ha);
if (error) {
printk(KERN_NOTICE "couldn't start queue thread:%d, "
"running in direct mode\n", error);
sas_ha->lldd_max_execute_num = 1;
}
}
INIT_LIST_HEAD(&sas_ha->eh_done_q);
return 0;
Undo_ports:
sas_unregister_ports(sas_ha);
Undo_phys:
return error;
}
int sas_unregister_ha(struct sas_ha_struct *sas_ha)
{
unsigned long flags;
/* Set the state to unregistered to avoid further
* events to be queued */
spin_lock_irqsave(&sas_ha->state_lock, flags);
sas_ha->state = SAS_HA_UNREGISTERED;
spin_unlock_irqrestore(&sas_ha->state_lock, flags);
scsi_flush_work(sas_ha->core.shost);
sas_unregister_ports(sas_ha);
if (sas_ha->lldd_max_execute_num > 1) {
sas_shutdown_queue(sas_ha);
sas_ha->lldd_max_execute_num = 1;
}
return 0;
}
static int sas_get_linkerrors(struct sas_phy *phy)
{
if (scsi_is_sas_phy_local(phy))
/* FIXME: we have no local phy stats
* gathering at this time */
return -EINVAL;
return sas_smp_get_phy_events(phy);
}
int sas_phy_enable(struct sas_phy *phy, int enable)
{
int ret;
enum phy_func command;
if (enable)
command = PHY_FUNC_LINK_RESET;
else
command = PHY_FUNC_DISABLE;
if (scsi_is_sas_phy_local(phy)) {
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
struct sas_internal *i =
to_sas_internal(sas_ha->core.shost->transportt);
if (!enable) {
sas_phy_disconnected(asd_phy);
sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
}
ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
} else {
struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
ret = sas_smp_phy_control(ddev, phy->number, command, NULL);
}
return ret;
}
int sas_phy_reset(struct sas_phy *phy, int hard_reset)
{
int ret;
enum phy_func reset_type;
if (hard_reset)
reset_type = PHY_FUNC_HARD_RESET;
else
reset_type = PHY_FUNC_LINK_RESET;
if (scsi_is_sas_phy_local(phy)) {
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
struct sas_internal *i =
to_sas_internal(sas_ha->core.shost->transportt);
ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
} else {
struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
}
return ret;
}
int sas_set_phy_speed(struct sas_phy *phy,
struct sas_phy_linkrates *rates)
{
int ret;
if ((rates->minimum_linkrate &&
rates->minimum_linkrate > phy->maximum_linkrate) ||
(rates->maximum_linkrate &&
rates->maximum_linkrate < phy->minimum_linkrate))
return -EINVAL;
if (rates->minimum_linkrate &&
rates->minimum_linkrate < phy->minimum_linkrate_hw)
rates->minimum_linkrate = phy->minimum_linkrate_hw;
if (rates->maximum_linkrate &&
rates->maximum_linkrate > phy->maximum_linkrate_hw)
rates->maximum_linkrate = phy->maximum_linkrate_hw;
if (scsi_is_sas_phy_local(phy)) {
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
struct sas_internal *i =
to_sas_internal(sas_ha->core.shost->transportt);
ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
rates);
} else {
struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
ret = sas_smp_phy_control(ddev, phy->number,
PHY_FUNC_LINK_RESET, rates);
}
return ret;
}
static struct sas_function_template sft = {
.phy_enable = sas_phy_enable,
.phy_reset = sas_phy_reset,
.set_phy_speed = sas_set_phy_speed,
.get_linkerrors = sas_get_linkerrors,
.smp_handler = sas_smp_handler,
};
struct scsi_transport_template *
sas_domain_attach_transport(struct sas_domain_function_template *dft)
{
struct scsi_transport_template *stt = sas_attach_transport(&sft);
struct sas_internal *i;
if (!stt)
return stt;
i = to_sas_internal(stt);
i->dft = dft;
stt->create_work_queue = 1;
stt->eh_timed_out = sas_scsi_timed_out;
stt->eh_strategy_handler = sas_scsi_recover_host;
return stt;
}
EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
void sas_domain_release_transport(struct scsi_transport_template *stt)
{
sas_release_transport(stt);
}
EXPORT_SYMBOL_GPL(sas_domain_release_transport);
/* ---------- SAS Class register/unregister ---------- */
static int __init sas_class_init(void)
{
sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task),
0, SLAB_HWCACHE_ALIGN, NULL);
if (!sas_task_cache)
return -ENOMEM;
return 0;
}
static void __exit sas_class_exit(void)
{
kmem_cache_destroy(sas_task_cache);
}
MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
MODULE_DESCRIPTION("SAS Transport Layer");
MODULE_LICENSE("GPL v2");
module_init(sas_class_init);
module_exit(sas_class_exit);
EXPORT_SYMBOL_GPL(sas_register_ha);
EXPORT_SYMBOL_GPL(sas_unregister_ha);